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Physics Circular Motion

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									11/11-12/10 – Physics                     WS #5 – Forces: Friction & Angled

The 4 Kinematic Equations
(1) v  at  v0    (2) (x)  v0 t  1 at 2   (3) (x)  1 (v0  v)t   (4) v 2  v0  2a (x )
                                                                                  2

                                     2                   2

(net F) = ma                 Fg = (9.8 N/kg)m                 [1 lb. = 4.44 N]
1. You are hanging your Thanksgiving decorations and think about the physics of a hanging turkey decoration. The
turkey decoration is 5 kg and hangs by two strings. One string is fixed to the ceiling at an angle of 30 degrees,
while the other string is horizontally attached to a wall. The hanging turkey decoration is at rest. Determine the
force of tension on the hanging turkey decoration by each string.
 First Attempt:                                                                  Corrections (if needed):




 2. While shopping for a thanksgiving dinner groceries, you push a 12 kg cart horizontally with a constant force of
 25 N. The cart’s motion down an aisle is plotted on the graph to the left. Determine a value for each force acting
 on the shopping cart. (Must friction be present? I purposefully didn’t tell you—see if you can figure it out)
 First Attempt:                                                                             Corrections (if needed):
11/11-12/10 – Physics                  WS #5 – Forces: Friction & Angled

3. Hovercrafts are cool because they basically move with no friction. If you pull a 2 kg hovercraft using a rope with
a force of 7 N at an angle of 25˚, what will its acceleration be? How much is the normal force? How many pounds
of force are you pulling with?
First Attempt:                                                                         Corrections (if needed):




4. You turn the 2 kg hovercraft off allowing for friction to act. You again pull horizontally on it with a force of 7 N,
what is the force of friction (in lbs and N) if the hovercraft now accelerates at 1.75 m/s2? What is the coefficient
of kinetic friction?
First Attempt:                                                                          Corrections (if needed):




5. You’re babysitting your cousin and he wants to get pulled around in a wagon. You pull him around in the wagon with
a force of 22 N at an angle of 15 degrees with the horizontal. Friction exerts a constant force of 9 N. The mass of
the wagon with your cousin in it is 60 kg. Determine the acceleration of the wagon. What is the normal force on
the wagon by the surface (in N and lbs)?
First Attempt:                                                                        Corrections (if needed):
11/11-12/10 – Physics                WS #5 – Forces: Friction & Angled

6. In physics class, a student offers her car to use for a class experiment. Her Toyota Corolla is 2600 lbs. Mr.
Bonner, who weighs 764 N, sits in the car by himself while a student pushes the car (in neutral). The student
pushes with a force of 50 lbs. The car starts from rest and moves 10 meters in 15 seconds during its acceleration.
What is the acceleration of the car, and what is the force of friction (in N and lbs)?
 First Attempt:                                                                 Corrections (if needed):




7. A kid on a skateboard is moving at a speed of 7 m/s when he begins to coast to a stop. It takes him 12 seconds
to come to a stop. The kid and skateboard have a total mass of 58 kg. What is the force of friction (in N and lbs)?
Determine the coefficient of friction. (also sketch x-t and v-t graphs)
 First Attempt:                                                               Corrections (if needed):




 x                      v                                                    x                     v


                  t                   t                                                      t                       t

								
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